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path: root/drivers/usb/host/ehci-sched.c
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Diffstat (limited to 'drivers/usb/host/ehci-sched.c')
-rw-r--r--drivers/usb/host/ehci-sched.c67
1 files changed, 44 insertions, 23 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index be575e4..b7853c8 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -1349,18 +1349,27 @@ iso_stream_schedule (
/* when's the last uframe this urb could start? */
max = now + mod;
- /* typical case: reuse current schedule. stream is still active,
- * and no gaps from host falling behind (irq delays etc)
+ /* Typical case: reuse current schedule, stream is still active.
+ * Hopefully there are no gaps from the host falling behind
+ * (irq delays etc), but if there are we'll take the next
+ * slot in the schedule, implicitly assuming URB_ISO_ASAP.
*/
if (likely (!list_empty (&stream->td_list))) {
start = stream->next_uframe;
if (start < now)
start += mod;
- if (likely ((start + sched->span) < max))
- goto ready;
- /* else fell behind; someday, try to reschedule */
- status = -EL2NSYNC;
- goto fail;
+
+ /* Fell behind (by up to twice the slop amount)? */
+ if (start >= max - 2 * 8 * SCHEDULE_SLOP)
+ start += stream->interval * DIV_ROUND_UP(
+ max - start, stream->interval) - mod;
+
+ /* Tried to schedule too far into the future? */
+ if (unlikely((start + sched->span) >= max)) {
+ status = -EFBIG;
+ goto fail;
+ }
+ goto ready;
}
/* need to schedule; when's the next (u)frame we could start?
@@ -1613,6 +1622,9 @@ itd_complete (
} else if (likely ((t & EHCI_ISOC_ACTIVE) == 0)) {
desc->status = 0;
desc->actual_length = EHCI_ITD_LENGTH (t);
+ } else {
+ /* URB was too late */
+ desc->status = -EXDEV;
}
}
@@ -2095,7 +2107,7 @@ done:
static void
scan_periodic (struct ehci_hcd *ehci)
{
- unsigned frame, clock, now_uframe, mod;
+ unsigned now_uframe, frame, clock, clock_frame, mod;
unsigned modified;
mod = ehci->periodic_size << 3;
@@ -2111,6 +2123,7 @@ scan_periodic (struct ehci_hcd *ehci)
else
clock = now_uframe + mod - 1;
clock %= mod;
+ clock_frame = clock >> 3;
for (;;) {
union ehci_shadow q, *q_p;
@@ -2157,22 +2170,26 @@ restart:
case Q_TYPE_ITD:
/* If this ITD is still active, leave it for
* later processing ... check the next entry.
+ * No need to check for activity unless the
+ * frame is current.
*/
- rmb ();
- for (uf = 0; uf < 8 && live; uf++) {
- if (0 == (q.itd->hw_transaction [uf]
- & ITD_ACTIVE(ehci)))
- continue;
- incomplete = true;
- q_p = &q.itd->itd_next;
- hw_p = &q.itd->hw_next;
- type = Q_NEXT_TYPE(ehci,
+ if (frame == clock_frame && live) {
+ rmb();
+ for (uf = 0; uf < 8; uf++) {
+ if (q.itd->hw_transaction[uf] &
+ ITD_ACTIVE(ehci))
+ break;
+ }
+ if (uf < 8) {
+ incomplete = true;
+ q_p = &q.itd->itd_next;
+ hw_p = &q.itd->hw_next;
+ type = Q_NEXT_TYPE(ehci,
q.itd->hw_next);
- q = *q_p;
- break;
+ q = *q_p;
+ break;
+ }
}
- if (uf < 8 && live)
- break;
/* Take finished ITDs out of the schedule
* and process them: recycle, maybe report
@@ -2189,9 +2206,12 @@ restart:
case Q_TYPE_SITD:
/* If this SITD is still active, leave it for
* later processing ... check the next entry.
+ * No need to check for activity unless the
+ * frame is current.
*/
- if ((q.sitd->hw_results & SITD_ACTIVE(ehci))
- && live) {
+ if (frame == clock_frame && live &&
+ (q.sitd->hw_results &
+ SITD_ACTIVE(ehci))) {
incomplete = true;
q_p = &q.sitd->sitd_next;
hw_p = &q.sitd->hw_next;
@@ -2260,6 +2280,7 @@ restart:
/* rescan the rest of this frame, then ... */
clock = now;
+ clock_frame = clock >> 3;
} else {
now_uframe++;
now_uframe %= mod;
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